Does a light bulb glow because....
a) there is burning inside
b) an electric current glows
c) the filament is hot
d) a very small current is flowing
Wouldn't you think it was because the filament was hot?
Of course, a very small current also CAN make a filament hot if the resistance is correct for the circuit; however, I think the intent of the question is to answer c.
That was my first choice, but does an electric current glow?
The filament in the bulb has resistance. The current flowing through the resistance of bulb causes the filament to dissipate energy in the form of heat and light. The filament is actually glowing white-hot because of the energy it is dissipating, thus giving off light. Therefore i think that your choice is correct.......thank you.....
An electric current itself does not actually glow. However, it is the electric current that passes through the filament of a light bulb that causes it to heat up and eventually glow. Let me explain the process in a bit more detail.
The filament in a light bulb is made of a material with high resistance to the flow of electricity, such as tungsten. When an electric current is applied to the filament, it encounters this resistance and, as a result, the filament heats up due to the electrical energy being converted into heat energy.
As the temperature of the filament increases, it reaches a point at which it starts to emit visible light. This is referred to as incandescence. The specific temperature at which this occurs depends on the material used for the filament.
The filament of a light bulb is designed to be highly resistant, meaning it restricts the flow of electric current and converts a significant portion of it into heat. This is why light bulbs tend to get hot when they are turned on for a while. So, while the electric current itself does not directly produce visible light, it is a necessary component in the process that leads to the filament heating up and emitting light.
In summary, the correct answer to the question "Does a light bulb glow because..." would be c) the filament is hot. The filament becomes hot due to the electric current passing through it, and this heat causes it to emit visible light.